#### Topic Content:

- Definition of Work
- Definition of Power
- Calculations Involving Power
- Watt Converter

- Definition of Energy

### What is Work?

**Work** can be defined as the product of force and distance through which an object moves in the direction of force applied.

Work (W) = Force (F) Ã— distance (D)

= Newton Ã— metre

= Joule (J)

**âˆ´** 1 J = 1 Nm

If the object doesn’t move, then no work is done.

Where Force is the product of mass and gravity or mass and acceleration (F = mg, or F = ma) (g = 10 m/s^{2})

The unit of work is **Joule **named after the scientist, James Prescott Joule, who did a lot of experiments with energy.

In the illustration above, the work done is the product of the force (12N) used to push the box and the distance (5m).

= 12 N Ã— 5 m = 60 J

**Joules Converter:**

Larger units are KiloJoule (KJ) and MegaJoule (MJ)

1,000 Joules (J) = 1 KiloJoule (KJ)

1,000,000 Joules (J) = 1 MegaJoule (MJ)

1,000 KiloJoules (KJ) = 1 MegaJoule (MJ)

### Example 1

If a force of 20 N is used to pull a Wheelbarrow through a distance of 8 m. How much work is done in the process.

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Impressive

Amazing. Thanks a lot for this